Valve.



O. WAINWRIGHT.

VALVE,

APPLIUATION I-ILED THE. 4, 1911.

Pziisnted 20, 31932.

3 .BHEETS-SHEET 1.

.4 Tram/E I". V

C. WAINWRIGHT.

VALVE.

APPLIOATION FILED EBB. 4, 1911.

Patented Aug. 20, 191 2.

3 SHEETS-SHEET 2.

G. WAINWRIGHT.

VVVV E. APPLIOAI IIIIIIIIIIIIIIIII 1.

EEEEEEEEEEEEE 3.

ATENT CHAR-LES WAINWBIGHT, 0F ERIE, PENNSYLVANIA.

VALVE.

isin m admin on 4,

Specification of Letters Patent.

Patented Aug. 2(8 1912.

Application filed February 4, 1911. Serial "No. 606,540.

wear of the valves of air compressors, and to this end the invention consists in provi mg means for retarding a valve 0t an'air com-' pressor while the valve is moving toward its seat.

Other objects will appear and be better understood from the following description taken in connection with the accompanying drawings, in which,

Figure 1 is a longitudinal section of one embodiment of the invention. Fig. 2 is a detail bottom plan of the cage. Fig. 3 is a longitudinal section of a modified form 0t 25 Fig. 4t 15 a horizontal section of the cage.

shown in Fig. 3 with the guide recage moved. Fig. '5 is a detail bottom plan of Fig. 4. Fig. 6 is a longitudinal section of a further modification.

In Fig. 1, 1 indicates a section of the cylinder, 2 the casing, and 3 the passage for the compressed air from the cylinder 1.

7 indicates a cage which seats at one end in a depression 5 in the cylinder and connects by means of-a screw thread 6 at its opposite end with the casing 2.

at is the opening through which the compressed air passes to the cage, and 28 1s a port through which communication is established between the interior of the cage and the passage 3.

10 is a cap or the-cage 7. p

The valve a which controls communication between the passage 3 and the opening 1 to the cylinder, is opened as usual during the compression stroke of the piston after which it is seated by the action of a spring 24 which is held against displacement. by a boss 12 and which when the valve is open, is compressed.

The tubular portion 20 of the valve is closed at one end by the head 21.

At the lower end portion of the cage there is a cross piece 1.4 which supports a guide bonnet for the outer end of upon which the tubular portion 20 is adapted to slide.

23 and 15 are different portions of an air chamber, one end 16 0t which opens into the passage 1, whereby compressed air will be forced into the chamber and against the head 21 during the compression stroke of the compressor. This will have the efiect of evenly distributing the pressure over the surface of the valve exposed to the compressed air and, thus prevent any tilting or wabbling tendency of the valve,

18 is a valve which yieldssubstantially synchronously with the valve a during the compression stroke of the compressor. This will have the effect of admitting the compressed air into the chamber 23 but at the end of the compression stroke and when the valve a begins to move under the action of the spring 2 1, the compressed air in the chamber '23 will seat the valve 18. Now, when it is remembered that the volume of the air chamber is greater when the valvea is 0 en than asshown'in Fi 1 it will be manifest that when the valve 18 is in its seat 17 and the valve a is moving to closed position, the air in the chamber 23 Will be compressed and thereby retard the movement of the valve a under the action of its spring 2 1. Thus it will be seen that the valve will not be slammed abruptly to its seat and will not soon wear out.

It is not desired to retain the air in the chamber 23 and, therefore I provide the vents 22'22 which form choked passages andpermit the air-to gradually escape during the movement of the valve a under the action of its spring.

19 is a stop which extends across the portion 15 of the chamber and limits the movement of the valve 18 in one direction.

Oil to the parts is conveyed through a duct 25 in the boss 12 and a bushing 26 having a spring-pressed valve controls the passage through the duct, the valve in the bushing, however, being adapted to yield under the weight of an oiler when the latter is placed thereon.

In the structure shown in Figs. 3, 4 and 5, the cage 28 is made separate from the valve seat ring 29 and as shown in Fig. 6, the cage 28 may be held down upon the ring 29 by means of-a set screw viaOthreaded into the cap 31.

This cap is threaded in the casing 2 and carries through the cap directly to the port 33 where oil is fed to the main valve 38 which works. in the opening or socket 32. The valve 38 is held upon a seat 39 by a spiral spring 40 which engages the cage and an upper portion of the valve flange and is movedoti of its seat by pressure in the cylinder against {the tension of the spring 40. When the valve rises the air in the cylinder passes out of the port 4 through suitable ports 41 formed in the cage to the passage 3 and theair in the chamber 42 whichis formed 'bet-weenfihe upper end of the cylinder and the end of the socket 32 raises the valve 35 off. its-seat and passes out of the orts 33 and 34. into the passage ways. hen ,the piston in' the cylinder recedes from the valve, the ball valve 35 seats and closes the chamber 42, thus upon further downward movement of the ,valve 38 and under the .actionof the spring 40, a vacuum is formed in the chamber 42- which retards the seating of the valve 38 and thereby cushions its action. In Fig. 7, the casing 2 has a plug 44 threaded thereinto which is provided with an inwardly extending guiding projection 45 which is surrounded by the valve operating spring 46.. The plug and guiding extension 44 and 45 are apertured as at 47 and 48, the latter being somewhat reduced so as to provide aseat 49 for the ball valve 50 which ls-held in place by a spiral spring 51. The spring is secured within the plug 44 by a tension nut 52 and the ports 47 and 48 communicate with the passages 3 by means of a port 53. The valve which is used in this construction is shown at 54 and seats dithe valve ascends under the impetus of pressure in the cylinder, the air which is in the chamber 55 formed between the valve and the projection rushes up the port 47 and out through the port 53 displacing the valve 50 in this movement. When the pressure in the cylinder is decreased and the valve 54 descends under the impetus of the spring 46,

the valve 50 closes and a vacuum is formed in the chamber 55 thus cushioning the valve upon, its seat.

In the structure shown in Fig. 8, the guiding projection 50 is surrounded by the valve 57 which seats directly upon the cylinder 1 and is operated upon by the spiral spring 58 i which engages the va e and the plug 59' ,in a manner similar to the arrangement 1: .shown in Fig. 7. In this instance however,

the valve is provided with diametrically. o'pposite apertures 60 which areadapted to register with suitable ports 61' formed. across the projection 50 and which are in communication with a central vertical port 62 from the chamber63. The chamber'63 is formed between the head of the valve 57 and the end of the projection. When the valyge ri'ses against the tension of the spring 58,

end of the projection. When the ports 60 pass the ports 61 in the downward movement of the valve, a vacuum is formed and the seating of the valve against the seat on the casing is properly cushioned.

Having thus described the invention,

is claimed is I -1. In combination with an a1r compressor valve formed with an air chamber which is open at one end; of a valve for the open end of the chamber adapted to open automatically with the opening of the compressor valve and to close automatically and seal the chamber during the closing of the-com pressor valve.

2. In 3.114111 compressor, the combination with a valve adapted to be connected tothe compressor and including a valve body, and

a guide therefor; of an air chamber having a portion located between the valve body and the guideand another portion opening into the compressed air passage of the compressor.

'3. In an air compressor, the combination with a valve adapted to be connected to the compressor and including a valve body, and a guide therefor; of an air chamber having a portion-located between the valve body and the guide and another portion valve controlled and opening into the compressed air passage of the compressor, and a valve arranged in the last-named portion of the chamber.

4. In a valve for compressors, a valve body formingone wall of an air chamber, a guide for the valve body and adapted to form another wall of the chamber and hav ing a passage for compressed air from the compressor to the chamber.

5. In a valve for compressors, a valve body forming one wall of an air chamber, a guide for the valve body and adapted to form anoth'er wall of the chamber and having a valve controlle'dfpassage for the com v pressed air from the compressor to the chamber. i

In a valve for compressors, a valve body adapted to form one Wall of an air chamber and to open under the action of compressed air from the compressor, a guide having an apertured end portion adaptedto form one Wall of an air chamber, a guide for the valve body adapted to form another wall or the air chamber ,and having a'pas' sage for compressed air fromthe' compressor to the air chamber, and a valve adapted for closing the passage prior to the closing of the first mentioned valve.

8. In a valve for compressors, a valve body adapted to be opened by the compressed air from the compressor and also adapted to form one wall of an air chamber, a guide for the valve body and having a pas-- sage communicating with the air chamber, a valve controllingthe passage and adapted to be opened by the air from the compressor and synchronously with the first named valve, said second named valve being further adapted to close the passage automatically during the closing of the first named valve for the purpose described.

In testimony whereof I afiix my signature in presence of tWo Witnesses.

I CHARLES W AINWRIGHT. Witnesses:

C. A. MAs'rnN, E. SHERMAN.

fiepies or this patent may he obtained for five cents each, by addressing the Commissioner of Yatents.

Washingtomfi. 83. 

